Power-transmitting mechanism



UNITED STATES PATENT o-Frics.

WILLIAM ESSINGTON ROBB, 0F OIL CITY, PENNSYLVAIA.

POWER-TRAN MECHNISM.

Application led .Tune 8, 1920. Serial No. 387,355.

To all whom t may concern.'

Be it known that l, WILLIAM E. ROBB, a citizen of the United States, and a resident of Oil City, in the county of Venango and State of Pennsylvania, have invented a new and Improved Power-Transmitting Mechanism, of which the following is a full, clear, and exact description.

This invention relates to power-transmitting mechanisms, and has particular reference to an eccentric transmission device used therewith.

An object of the invention is to provide an eccentric power-transmission element in which the friction generated in the device is reduced to a minimum.

Another object is to provide an eccentric power-transmission element which is compact, composed of a minimum number of parts, and capable of transmitting larger amounts of power than hitherto has been the case.

A. further object is to provide improved and efficient lubricating means whereby the generation of the minimum amount of friction is maintained.

The device in which my invention is embodied comprises an eccentric wheel mounted on a suitable power driving shaft which is adapted to be connected by link mechanism with any apparatus to be driven, such as an oil well apparatus. The eccentric comprises a hub portion and a rim portion interconnected by a web portion. On the upper and lower faces of the eccentric a plurality of flanges are so spaced and arranged as to provide an annular groove in which one or more rollers are adapted to move, these rollers being connected to a suitable link mechanism.

The invention further resides in the provision of suitable lubricating channels to the rollers whereby these may be readily and simply lubricated during the operation of the eccentric.

The invention still further resides in other mechanical arrangements and details of construction as will be apparent from a consideration of the Jfollowing specication and claims.

The invention is illustrated in the draw# ing, in which- Figure 1 represents a vertical longitudinal section through the eccentric on the line 1 1 of Fig. 2;

F ig. 2 is a plan view of the eccentric; and

Fig. 3 is a partially vertical section showing a modication of the lubricating feature.

'The device embodying my invention comprises a shaft 1 to which is keyed a hub 2 connected by a web portion 3 with a rim portion 4. The hub 2, the web 3 and the rim 4 forma circular plate or wheel which is eccentrically mounted with respect to the shaft .1. On each side of the web portion 3,`the in ner face of the rimv portion 4 is provided with smooth curved walls 5 and 6. At the outer ends of these walls are small projecting annular ribs 7 and 8. The rib portion 7 1s cut away along part of its length, as indicated in Fig. 2 at 9, for a purpose to be hereinafter explained. Spaced apart froml the walll 5 is a flange portion 11. 4This flange. portion 11 is spaced an equal distance away from the wall 5 throughout its length and forms a curved groove in which a roller 13 is adapted to move. The roller 13 fits not too loosely in this groove and is connected by pins 15 with an arm 17 fastened to a link 19. A lower roller 14 bears against the wall 6 and is connected to link 19 by arm 18 and 4pin 16. It will be evident that the roller 13 may be inserted inits groove by inserting it into the groove through the cut-away portion 9 above mentioned, after which the arms 17 and 18 may be connected to the pins 15 and 16 by means of nuts 2O and 21. The roller 13 in the groove is provided with an oil passage 22 through which oil is adapted to seep to the pin 15. This groove in which the roller 13 moves, itself forms a reservoir in which the oil can be placed. The pin 16 on the lower roller 14 extends slightly above the Vupper face of the roller 147 and there is provided a groove 23 in the web portion 3 above the end of the pin providing a clearance space. An oil passage 24 extends from this clearance groove 23 and leads to the outer edge of the rim 4 by means of another passage 25, which be closed by any suitable plug. A side passage 26 connects with a shallow groove 27 in the top face of the rim portion 4. Oil may be placed in this groove 27 while the eccentric wheel is in motion and will be led down through the passage above mentioned to the groove 23. In this groove 23, suitable absorbent material (not shown) may be placed, against which the upper end of the pin 15 will rub and from which it thereby obtains its lubrication. Several sets o passages such as those just above mentioned are providedaround the wheel.

ln Fig. 3 a passage 28 is shown leading from the groove 27, and in turn connecting with a passage 29 leading to the wall 6 on the inner face of the rim. This' provi les means whereby the wall 6 andthe faceoi the roller 14 may be lubricated. Any suitable number of passages of this sort may be provided around the wall.

Apertures 30 and 3l are provided in the web portion of the eccentric so that by inserting proper leverage devices in these holes the eccentric can be moved and `adjusted whenever desired.

' This eccentric is particularly adaptable for use in power-transmitting mechanisms, especially'inconnection with oL erating oil wells. It has been customary to provide eccentrics comprising a solid eccentrically mounted casting of metal with a solid rim around the same, and to which rim the oil" wellapparatus links were connected. The power was transmitted from one element to theother and great amounts of friction re sulted by reason of the sliding friction hctween the eccentric and itskrim which took place around the entire periphery of the eccentric, especially when large amounts of power were being transmitted. The device embodying my invention, by reason of the use of rollers which are elliciently lubricated, generates a minimum amountV of friction. The eccentric is simple, in that it is made in one piece, and is not larger than the devices heretofore used. In operating a plurality Vor apparatus, more than one setl of rollers may be used, and it is possible to have a plurality of eccentricson the same shaft disposed lnsuch a manner as to balance each other with respect to their tendency to strain the shaft on which they are mounted.

ldhat l claim is; 'Y

l. A power-transmitting device compris# ing an eccentric having a rim and a web portion, a power-transmitting roller engaging a face of the rim below the web portion, an annular groove in the Vupper face of the rim, and a plurality of passages from said groove to points in the web under which the roller passes.

2. A power-transmitting device comprising an eccentric having a rim and a web portion, a power-transmitting roller engaging a iace of the rim below the web portion, a pin on which the roller rotates, an annular groove in the upper face of the rim7 and a plurality of passages from said groove to points in the `web under which the pin passes. Y

3. A power-transmitting device comprising an eccentric having a rim and a web portion, a power-transmitting roller engaging aface of the rim below the web portion,

an annular groove in the upper face of the' rim, a plurality of passages :from said groove to points in the web under which the roller passes, anda second series of passages connecting the irst-named 'passages with the peripheral face of the rim,

4C. A power-transmitting device comprising an eccentric having a rim and a web portion, a power-transmitting roller engaging a face of the rim below the web portion, an annular groove inthe upper face of the rim, a groove in the racc of the web adjacent the path traveled'byY the center of the roller, and a plurality of passages connecting these two grooves at intervals around therim.

` WlLLlAM ESSINGTON RQBB. 

